Define a racket function that duplicates the functionality of map

Question

Define your own Racket function that duplicates the the functionality of map from the standard library. You may not use the built-in map function as an auxiliary function.

Input: A function name (of a function that takes a single argument) and a list of elements of the same data type compatible with the function.

Output: A new list of the original elements with the same function applied to each. Example:

(my-map sqrt '(9 25 81 49))

'(3 5 9 7)

(my-map double '(6 4 8 3))

'(12 8 16 6)

(my-map sqr '(5 7))

'(25 49)

SO users help other users when they're stuck with an approach. We're not here to do your homework problems! — Axe
– Axe, Commented Jun 30, 2016 at 20:06

soegaard · Accepted Answer · 2016-07-01 08:24:25Z

1

Read part three of HtDP version 2.

http://www.ccs.neu.edu/home/matthias/HtDP2e/part_three.html

In particular pay attention to section 17.1.

Some advice on starting this problem:

Write a function map-sqrt that takes a one argument, a list of numbers, as input and outputs a list of numbers (the square roots of the input numbers).

Write a function map-sqr that takes a one argument, a list of numbers, as input and outputs a list of numbers (the square of the input numbers).

These two functions are very similar. Use the approach in section 17.1 in order to see what a general map function looks like.

edited Jul 1, 2016 at 8:24

answered Jun 30, 2016 at 20:55

soegaard

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